package bigdata.mapreduce.statistics;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.GenericOptionsParser;

public class StatisticsJob {
	public static void main(String[] args) throws IOException, ClassNotFoundException, InterruptedException {
		// TODO Auto-generated method stub
		Configuration conf=new Configuration();
		conf.set("fs.defaultFS", "hdfs://localhost:9000");
		String[] otherArgs=(new GenericOptionsParser(conf,args)).getRemainingArgs();
		if(otherArgs.length<2) {
			System.err.println("Usage:Statictics<in>[<in>...] <out>");
			System.exit(2);
		}
//		else {
//			for(int i=0;i<otherArgs.length;i++) {
//				System.out.println(otherArgs[i].toString());			
//			}
//			System.out.println(WordCount.class.toString());
//			System.exit(0);
//		}	
		
		Job job=Job.getInstance(conf,"Statictics");
		job.setJarByClass(StatisticsJob.class);
		
		job.setMapperClass(bigdata.mapreduce.statistics.Map.class);
		job.setReducerClass(bigdata.mapreduce.statistics.Reduce.class);
		
		job.setMapOutputKeyClass(IntWritable.class);
		job.setMapOutputValueClass(IntWritable.class);
		
		job.setOutputKeyClass(IntWritable.class);
		job.setOutputValueClass(Text.class);
		
		for(int i=0;i<otherArgs.length-1;i++) {
			FileInputFormat.addInputPath(job, new Path(otherArgs[i]));			
		}
		
		FileOutputFormat.setOutputPath(job, new Path(otherArgs[otherArgs.length-1]));
		
		System.exit(job.waitForCompletion(true)?0:1);	
	}
}
